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I opened up a 1970s vintage sewing machine treadle the other day expecting to find some triac type chopper controller but instead found a weird plunger type of thing with what looks like carbon rods either side. what's the mechanism? I guess I should post a pic but its in the shed and I cant...

I am considering to refresh an existing woodburning/multifuel stove "hearth". the stove flue exits the back of the stove unit and proceeds horizontally into the vertical wall of the room. the wall in this area is some sort of fireproof board (something slightly different to plasterboard...

About to take on a project in Ealing, London what should I expect to pay hourly for domestic electrician? cheers

is this (attached schematic) "phase converter" drawing correct? I have attempted to draw out the circuit of a machine that I have. I think it is a static phase converter, which as far as I can make out is essentially a start/run capacitor system for getting a 3-ph motor turning, at which point...

is there such a thing? a pal of mine thinks that he used to have a PTZ speedome camera which had some sort of ring assembly just above the perspex dome. this ring assembly could motion-trigger, and then the camera would automatically slew to the angle at which the motion was detected. he may be...

yes our water is some variant of economy seven, so the water is heated by the least expensive means in the local area (ther is no mains gas here)

Well, clearly you can: I just have. but is it about to explode?! An old AEG dishwasher model OKO Favorit 80800 Sensor Logic. Has one water intake. hose on said water intake is grey plastic effort with normal "washing machine" threaded connector. On this connector it says "90 degrees C max". I...

how many tubes are being advertised here?

What's wrong with this - if anything? (it is a domestic consumer unit, wired up controlling 24VDC circuits. the breakers are in the Batt positive (+24VDC) line, with the Batt negative (0VDC) line applied to the Neutral busbar. The red DP breaker breaks both incoming poles, the rest of the MCBs...

what other reasons, John?

Yes, exactly as you say: the situation where, were you to put an ideal clamp meter around the whole 3-conductor cable, it would read non-zero. we are having real trouble in reliably tracking this cable with the equipment we have. sometimes it tracks OK, mostly not. the equipment manufacturers...

the ulterior motive in this case is to track an underwater cable using a triaxial fluxgate array which will detect (and even triangulate) current flow. The accepted way of doing this is to force the cable to carry a current, by applying a "tone" to the cable ashore, from a tone generator. said...

and meantime, less is more old boy, as the actress said. If you don't know, then that is OK! we won't think any less of you for not responding. we might think less of you for responding unhelpfully.

just put yourself in my position; it was not particularly unwelcome, it was just a trifle irksome. I came to an informative forum for practical guidance. I value the forum because of its practical nature. the information available within & upon it is subtly different to that available through...

this is precisely my point - so - please may I ask the question again, is it possible for DNO's to monitor the integrity of a neutral line from substation to consumer(s)? is it ever done? if so, how is it done? I can see that it *should* not present a problem, but under certain circumstances, it...

really the most rudimentary of google stalking ought to give you a good idea about why I was asking the original question! simply phrasing a question as if it came from an academic exercise does not mean that it did. I guess it could mean that I have in the past, done quite a few such exercises...

Sorry, B-A-S, but you are - once again - wrong in your divination of what other people's ulterior motives might be. This is an internet forum. All you really have to go on is what people write in the messages that get published upon it. Sherlock Holmes was a fictional character, there is no need...

and the answer to your fatuous question is, I do not need to know. I am merely curious. this particular splinter of curiosity was piqued by a discussion about the dangers or otherwise of setting up an RF earth in one's garden

why did you feel the need to ask that rather fatuous question?

consider a subsea cable interconnector, three phase, 33kV 50hz, linking an offshore island to a mainland. in this cable are 3 conductors only, 1 for each phase. Under what circumstances could a net current be flowing in this cable?